| 摘要 |
PURPOSE:To enhance contact with an original picture, to reduce time necessary for contact, and to enable faithful reproduction of the picture, by coating the uppermost layer with a soln. or liq. dispersion contg. a nonvolatile component, and forming small scattered protuberances by flocculation force of the soln. or the dispersion. CONSTITUTION:The surface of a silicon rubber is coated with a soln. or liq. dispersion contg. nonvolatile components as an ink repelling layer, and the liq. coating is flocculated on the silicon rubber layer to form scattered small protuberances on said layer surface by drying the drops of said liq. formed on said surface by the flocculation. As the nonvolatile component, the following materials are usable: casein, celluloses, starches; polyvinyl alcohol, polystyrene, and polyolefin, and the like resins, matting agents, such as titania, zirconia, glass particles, alumina, and starch, and combinations of resins and matting agents. Said small protuberances formed on the ink repelling layer can be removed very easily in developing or the like, and they have an effect of protecting the ink repelling layer ready to be scratched without adversely affecting plate performance in printing. |
